Hi Eric,
I do not know about the KR but found this
Bank 1 and Bank 2 refer to the two sides of the engine. Bank 1 is the side that contains cylinder #1, while Bank 2 is the side that contains cylinder #21. Sensor 1 and Sensor 2 refer to the oxygen sensors that measure the oxygen level in the exhaust gases. Sensor 1 is located before the catalytic converter, while Sensor 2 is located after the catalytic converter1
The oxygen sensors on a Jaguar XKR are connected to the exhaust pipe, either in front or back of the catalytic converter1. To locate the O2 sensor directly in front of the catalytic converter on the driver's side of the Jaguar, look for a white sensor with a green wire protruding from it2. Another way to locate the sensor is to look to the right of the intake manifold, where there is a grey plug visible. Next to it is a black one. Follow that lead down to below the catalytic converter3.